Release gax-java v1.54.0

[chingor13]

This pull request was generated using releasetool.

02-27-2020 09:07 PST

New Features

• Scale number of threads to scale with number of cpus (#878)
• Do not shut down executor when WatchDog is shut down (#871)

Dependencies

• Update google-http-client to 1.34.2 (#886)
• Update gRPC to 1.27.2 (#885)
• Update protobuf to 3.11.4 and gRPC to 1.27.1 (#882)

Documentation

• Add javadoc about being called within single thread (#856)

Internal / Testing Changes

• Update jacoco to 0.8.5 (#883)
• Update google format plugin (#868)
• Set up linkage monitor Kokoro build config for gax-java (#864)

[codecov]

Codecov Report

Merging #889 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #889   +/-   ##
=========================================
  Coverage     78.51%   78.51%           
  Complexity     1157     1157           
=========================================
  Files           203      203           
  Lines          5110     5110           
  Branches        402      402           
=========================================
  Hits           4012     4012           
  Misses          923      923           
  Partials        175      175

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[yoshi-automation]

Release is at https://github.com/googleapis/gax-java/releases/tag/v1.54.0

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[yoshi-automation]

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